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Multiple SSH Keys settings for different github accounts

Say you have two keys. Add these two keys as following to ssh agent running on your local machine: $ ssh-add ~/.ssh/id_rsa_hacker $ ssh-add ~/.ssh/id_rsa_exchan You can check your saved keys $ ssh-add -l Sample ssh config settings, uses aliases in first line of blocks Host github-hacker HostName github.com User git IdentityFile ~/.ssh/id_rsa_hacker Host github-exchan HostName github.com User git IdentityFile ~/.ssh/id_rsa_exchan then use normal flow to push your code git clone git@github.com:hacker/myrepo.git set remote host from the default (github.com) to match alias in the ssh config git remote set-url origin git@github-hacker:hacker/myrepo.git you can see the change in .git/config file if you look carefully
git add . git commit -m "your comments" git push

Docker training on Mac, 001

Take these steps, and, afterwards, try to understand how and why they worked, including flags/options "passed into" the command.
install Docker for Macverify installdocker --versionrun basic container testdocker run hello-worldinstall iTerm2open a terminal window and split horizontally, then closeopen a terminal window and split vertically, then closerun webserveropen a terminal window and split horizontalin bottom pane, run: watch -d -n7 docker ps -aas you take steps below, watch what changes occur in this windowin top window, run:docker run -d -p 8080:80 --name mywebserver001 nginxopen this in your web browserhttp://localhost:8080shut it downdocker stop mywebserver001docker rm mywebserver001

Linux boot process

There seems to be a strong interest when interviewing in this process.

biosstands for: basic input / output systemdoes system integrity checksfind and runs MBR boot loader programmbrlocated on first sector of bootable diskunder 512 bytes, 3 partsprimary boot loader info (446 bytes)disk partition info (64 bytes)mbr validation check (last 2 bytes)contains info on GRUBsummary: loads and exec GRUBgrubkernelinitrunlevel

System Services Migrating from Operations Teams to The Cloud

Done, or in process to some degree.
system installsdisk formattingvolume managementdatabase replicationmonitoring toolsservice start / stopservice start / stop scriptsbackup automation

fizzbuzz in ruby

#!/usr/bin/env ruby (1..100).each do |num| three = (num % 3 == 0) five = (num % 5 == 0) print 'fizz' if three print 'buzz' if five print num if (!three and !five) puts end

Docker: simple example, fast

See github link for instructions on how to run.
docker-compose.ymlversion: '2' services: app: build: context: ./ dockerfile: app.docker ports: - "80:80" app.dockerFROM silintl/ubuntu:16.04 RUN echo 'debconf debconf/frontend select Noninteractive' | debconf-set-selections RUN apt-get update RUN apt-get install -y apache2 WORKDIR /var/www/humankind RUN echo " \n\ \n\ ServerName humankind \n\ DocumentRoot /var/www/humankind \n\ \n\ " >> /etc/apache2/sites-available/humankind.conf RUN a2dissite 000-default.conf && a2ensite humankind.conf RUN echo "Automation for the People" > /var/www/humankind/index.html EXPOSE 80 CMD ["apache2ctl", "-D", "FOREGROUND"]
See: https://github.com/pcleddy/mini001